William Castle demonstrated that gastric juice contained an "intrinsic factor" which when combined with meat ingestion resulted in absorption of the vitamin in this condition
On top of that, the injectable form carries the same practical drawbacks as other injectable peptides: needles, sterile reconstitution, refrigeration, degradation after mixing, and the ongoing friction of maintaining a regular injection routine for benefits that build gradually over months
L-Carnitine Supplementation in Patients with Advanced Cancer and Carnitine Deficiency: A Double-Blind, Placebo-Controlled Study
Acknowledgments This research was supported by the William H
Proper techniqueincluding correct landmarking, needle length selection, and injection angleis essential to avoid complications such as nerve injury, muscle damage, or improper medication delivery